EP2422864A1 - Filtervorrichtung - Google Patents

Filtervorrichtung Download PDF

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Publication number
EP2422864A1
EP2422864A1 EP11178708A EP11178708A EP2422864A1 EP 2422864 A1 EP2422864 A1 EP 2422864A1 EP 11178708 A EP11178708 A EP 11178708A EP 11178708 A EP11178708 A EP 11178708A EP 2422864 A1 EP2422864 A1 EP 2422864A1
Authority
EP
European Patent Office
Prior art keywords
housing
filtration device
filter element
filtration
effluent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11178708A
Other languages
English (en)
French (fr)
Inventor
Yannick Juhere
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maya Group
Original Assignee
Maya Group
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Maya Group filed Critical Maya Group
Publication of EP2422864A1 publication Critical patent/EP2422864A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/31—Self-supporting filtering elements
    • B01D29/35—Self-supporting filtering elements arranged for outward flow filtration
    • B01D29/353—Self-supporting filtering elements arranged for outward flow filtration with corrugated, folded filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/52—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
    • B01D29/6438—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element nozzles
    • B01D29/6453—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element nozzles with a translational movement with respect to the filtering element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/70—Regenerating the filter material in the filter by forces created by movement of the filter element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
    • B01D35/027—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks rigidly mounted in or on tanks or reservoirs
    • B01D35/0276—Filtering elements with a vertical rotation or symmetry axis mounted on tanks or reservoirs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
    • B01D35/143—Filter condition indicators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
    • B01D35/153—Anti-leakage or anti-return valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/18—Filters characterised by the openings or pores
    • B01D2201/184—Special form, dimension of the openings, pores of the filtering elements

Definitions

  • the present invention relates to a filtration device intended to be used in a pit intended to contain an effluent and in particular a so-called "all waters" pit, the device being provided with a cleaning system to unclog it, if appropriate, according to a prescribed periodicity.
  • an all-water pit is a septic tank equipped with a filtration device, also called prefilter, to prevent it from rejecting too coarse particles in a filtration system connected downstream of the pit.
  • the filtration device is installed in a pit all waters, to retain in it, said particles in suspension in order to keep in good working order the filtration system avoiding clogging. Its use is made mandatory.
  • This filtration device Maintenance of this filtration device is scheduled once or twice a year. The operator must disassemble the filter element that it contains to clean it. For this, it opens the manhole provided on the pit, then disconnects the filter device by the denoitant of effluent outlet pipe through the pit. It then dismounts the filter element of the device and proceeds to its cleaning, for example, using water under pressure. He goes back inside the device and reinstall it into the pit. This operation turns out, we can see, long and messy.
  • the applicant has sought a faster, less messy and equally effective solution for cleaning such a prefilter.
  • a filtration device intended to be connected to a pit for filtering the largest particles of an effluent that it may contain, comprising at least one receiving housing for a hollow-type filter element internally. ; according to the invention, the device incorporates a cleaning nozzle adapted to be moved inside said housing to clean the filter element.
  • the filter element By moving the nozzle, the filter element can be cleaned without having to disassemble it.
  • the maintenance time is reduced and the work is less messy than a mounting operation, cleaning, reassembly of the filter element, known from the prior art
  • the device comprises an outlet housing of the effluent connected to one end of said or each housing, at least one inlet opening of the effluent being provided at the free end. said or each housing, an outlet of the filtered effluent which passes through said housing.
  • the nozzle is connected to a tube for supplying a pressurized fluid leaving said housing.
  • the pressurized fluid can then be sent through the nozzles.
  • the device comprises two housings longitudinally joined together two tubes, via an external collector, and whose intermediate arm serves as an operating handle for moving the nozzles.
  • the displacement of the cleaning nozzles of the filter elements is obtained by operating a handle external to the device.
  • the device incorporates remote operating means to facilitate its installation and removal from the pit.
  • the operating means consists of a handle whose free end is intended to be held by the hand of the operator who installs the device and whose other end is hitched to a tenon secured to the housing.
  • the housing and the housing consist of two half-shells joined at a joint plane which is secant to a median plane of said or each housing.
  • staples are provided at the joint plane of the two half-shells to keep them together.
  • the filtering element consists of a perforated peripheral wall, open at its end intended to be turned towards the openings and closed on the other by a closure wall through which a corresponding tube passes though.
  • the effluent enters the inside of the filter element and leaves, filtered, passing through its perforated peripheral wall.
  • the filter element is formed of two parts together and whose common joint plane is secant to the axis of said filter element.
  • the filter element is slidably mounted in its housing between a low filtration position where its outlet is in contact with a return wall provided above the openings of each housing, forcing the effluent to be filtered, through the filter element, and a high cleaning position where it is brought into contact with a stop located at the outlet of the housing in the housing to allow the evacuation through the openings, the particles detached to the outside of the filter element.
  • the filter element can be moved between these two remarkable positions via the nozzle.
  • a redan provided along the inner wall of each housing cooperates with an elastic portion made longitudinally on the corresponding filter element to maintain it in its upper position.
  • the particles removed from the filter element Being held in its high cleaning position, the particles removed from the filter element are discharged outside the device, while it cleans it.
  • the nozzle comprises a perforated ogive at the periphery and which is connected to a corresponding tube, fingers provided for centering and guiding said nozzle during its sliding inside the filter element.
  • the nozzle is then positioned and guided correctly in the filter element.
  • the end of the nose is protected, in a low parking position of the nozzle, in a well provided in a bottom wall closing the free end of said or each housing.
  • the device incorporates a lock adapted to lock the operating handle in the low position protected from the nozzle and / or in the low position of filtration of the filter element.
  • the device is configured to filter the effluent.
  • a flap provided with at least one float is hingedly mounted between two framing cheeks of the outlet orifice to form a raising of the output level of the effluent.
  • the device incorporates a warning means of the low position and / or the high position of the filter element.
  • the user can thus control the position of the nozzle and the position of the filter element.
  • the pit F presented on the Fig. 1 is a pit called "all waters" intended to collect domestic wastewater from a habitat to decant so that the effluent it contains can then be discharged to a filtration system.
  • a filtration device must be installed in a pit or immediately downstream of it so that it can retain the coarsest solid particles that may escape from the pit to avoid the risk of clogging. filtration system so that it can function optimally.
  • This standard stipulates that the filtration device must be accessible so that it can be removed in order to carry out its maintenance. This filtration device is still called prefilter in the profession.
  • the pit F comprises a wastewater inlet, not visible in this partial view, and an outlet port S2 of the pre-treated effluent, which is crossed by a connecting pipe R to the filtration system.
  • a manhole T normally closed by a cover C, passes through the envelope of the pit F so as to allow, in particular, access to the filtration device 100.
  • a filtration device 100 meeting this requirement is installed in the pit F presented on the Fig. 1 .
  • It consists of a body 200 for receiving at least one filter element into which the effluent to be filtered can be admitted for filtration and which opens into an outlet box 300 intended to be connected to the outlet orifice. S2 of the pit F, to reject out of it, the filtered effluent.
  • the body 200 is constituted, on the Fig. 2 , two cylindrical housings 210 longitudinally contiguous and in which can take place respectively two filter elements of the effluent. They are connected by one of their end to the output housing 300. A bottom wall 230 closes this free end. Outlets 220 peripheral effluent admission through the housing 210, upstream of this bottom wall.
  • Feet placed under the two bottom walls make it possible to lay the filtration device in a stable and vertical manner on a horizontal surface.
  • the presence of two housings 210 provides better resistance to obstruction of the device, because if the inlet openings of a housing are blocked by a non-degraded foreign body (plastic film for example), the entrance of the other housing, which remains unobstructed, allows its operation almost normal.
  • the filtration device however comprises only one housing to lower its manufacturing cost.
  • the outlet housing 300 is intended to collect the treated effluent to channel it to the outlet of the pit. It is in a generally parallelepipedal shape, and the upper wall which constitutes it is hollowed out of a recess giving it, in front view, the shape of a U.
  • An operating handle 302 of the device is arranged in this recess for the maneuver and allow, in particular, its mounting in the pit and its disassembly. Both housings open into the housing 300 through its bottom wall.
  • An outlet port 304 opens through one of its side walls. It is extended by a connecting sleeve 306 of a diameter compatible with that of the connecting pipe of the pit.
  • connection connector object of the patent application no. 09/51375 the applicant could be interposed between the filtration device and the connecting pipe of the pit to facilitate disassembly and reassembly of the filtration device, while avoiding the rejection of coarse particles outside the pit, while the device Filtration is disassembled.
  • the filtering device could be placed outside the pit.
  • the outlet port of the latter would then be connected to the body of the device so that the fluid can penetrate into it.
  • the receiving body 200 and the outlet housing 300 are preferably constituted by two half-shells 110a and 110b joined at a common joint plane which is intersecting the median plane of the two housings 210. This construction facilitates the manufacture by molding of these constituents and allows mounting by enclosing between these two parts of the filter elements in their respective housings.
  • Staples 102 respectively comprising lugs snapped into notches, are provided at regular intervals at the joint plane of the two half-shells 110 to keep them together. The separation of these two constituents is however possible to replace, if necessary, the filter elements.
  • the filter element 400 presented on the Fig. 3a is intended to retain the largest particles contained in the effluent and which enter the filtration device. It consists of a cartridge comprising a peripheral wall 402 open at one end and closed at the other by a top closure wall 404.
  • the peripheral wall 402 is perforated with a plurality of holes O of a calibrated dimension. Each hole preferably has an oblong shape capable of delaying its obstruction while maintaining a high filtration capacity.
  • the open end of the filter element, visible at the bottom on this Fig. 3a is intended to be turned towards the inlet openings of the effluent at the end of its assembly in the device.
  • the filtering element 400 has in cross-sectional shape, visible on the Fig. 3b , thus providing a larger filtration area.
  • a filter hole O the peripheral wall 402 at the outlet thereof has a conical shape whose angle is obtuse to accelerate, by a venturi effect, the exit velocity of the effluent.
  • the filter element 400 advantageously consists of two parts 410a, 410b, joined at a common joint plane which is secant to the axis of the cartridge when assembled. These two parts are preferably identical constituents. Staples 406, respectively comprising lugs snapped into notches, are provided at regular intervals at the joint plane of the two components to hold them together. On the Figs. 3a and 3b , the two parts are presented disassembled, one in front of the other.
  • a space E is devolved between the housing 210 and the corresponding filter element 400 so that the filtered fluid can flow into the outlet box and be discharged outside the pit through its outlet port.
  • the filter device 100 is provided with a cleaning means 500 of its filter elements 400 when they remain in place, that is to say when they are enclosed in their respective housings.
  • the cleaning can be done quickly without the need to disassemble the filter elements.
  • each filter element It is intended to send inside each filter element, a jet of a fluid under pressure, such as water, over almost its entire height in order to unclog the obstructed filtration holes to unclog said filter element.
  • a jet of a fluid under pressure such as water
  • a cleaning nozzle 510 connected to a tube 520 for supplying the pressurized fluid and its connection 530.
  • This feed tube can slide through the upper wall of the housing 300 and the wall 404 high closing filter element 400, for this purpose crossed a passage hole.
  • the nozzle is disposed inside each housing so that it can slide inside a corresponding filter element over almost its entire height, between a low parking position and a high position, to clean it. , and which are visible on the Fig. 5 , respectively on the half-view on the right and on the half-view on the left.
  • Fig. 4a On the Fig. 4a , two filter elements are mounted respectively in the two housings and the two corresponding tubes, which are connected at one end to the two nozzles, are connected at their other end to an external collector 540 on which is mounted the connection 530.
  • This collector presents on this Fig. 4a , the shape of a U returned so that its intermediate branch can serve as operating handle cleaning means 500 for sliding the nozzles inside the filters.
  • the nozzle 510 consists of a nose 512 closed at one end and fitted with its other end in a corresponding tube 520, and fingers 514 for centering and guiding the latter during its sliding inside the filter element 400.
  • the free and closed end of the nose 512 is pierced at its periphery with at least one row of perforations capable of projecting inside the filter element of the pressurized water. This end of the nose is protected in a cylindrical well 232 provided in the bottom wall 230 of each housing 210 and this in the lower position of the nozzle 510.
  • the ends of the fingers form a stop in the low position of the nozzle cooperating with a return wall provided in the lower end of the filter element 400.
  • each filter element 400 has the ability to slide in its corresponding housing between a low filtration position visible on the right half-view and a high cleaning position, visible on the left half-view.
  • the filter element In its low position, the filter element is in abutment on a return wall 234 provided above the openings 220 of each housing 210 forcing the effluent to pass through the filter element 400 to be filtered.
  • the filter element In its high position, the filter element is in contact with a stop 240 located at the outlet of the housing 210 in the housing 300 to allow the evacuation through the openings 220, particles detached from the outside of the filter element.
  • This abutment here consists of a framing cheek 240 of the outlet orifice 304 of the casing 300.
  • the displacement of the filter element between its two extreme positions is implemented by the displacement of the nozzle 510 towards the end of his excursion, when pulling the handle 540 or when pushing it.
  • the high position of the filter element can be maintained thanks to a redan 236 provided along the inner wall of each housing, acting on an elastic portion 408 made longitudinally on the corresponding filter element.
  • At least one slideway 250 is provided longitudinally in each housing 210 for, in cooperation with at least one corresponding pin 412 provided on the outer wall of the filter element, guide without the ability to rotate during its sliding.
  • This guide means is also visible on the enlarged detail view of the Fig. 4b .
  • a similar construction exists between the cleaning nozzle 510 and the filter element 400 so that the latter slides longitudinally in the filter element without the ability to rotate.
  • Notches 516 visible on the Fig. 4b , are thus provided at the ends of the fingers 514 to cooperate respectively with rails 414 made longitudinally in the filter element 400.
  • a flap 242 provided with at least one float is hingedly mounted between the two cheeks 240 of the frame of the outlet orifice 304 to reduce the outflow from the pit, when the level of the effluent exceeds the level top of the filter elements.
  • the level of the effluent rises in this way, it raises the float which brings the shutter back to the vertical.
  • the two cheeks 240 and the shutter then form a riser flanking the outlet orifice 304 to limit the outlet flow of the pit, an unfiltered effluent may be introduced into the outlet housing 300 of the filtration device.
  • the device 100 incorporates a warning means indicating to the operator, as he moves the nozzles, that the filter elements are in their cleaning position or in their rest position.
  • this means takes the form of a sleeve 522 which is interposed on each tube 520 at a particular height to come, in cooperation with elastic walls 310 provided in the recess of the housing 300, to warn the operator that the nozzles 510 are arranged in the upper position, and to be more precise, when the nozzles have moved the filter elements in their cleaning position.
  • This sleeve 522 incorporates a central portion disposed between two beads so that this central portion can be slightly retained by the elastic walls 310 by emitting a characteristic noise.
  • rings 542 surround at a particular height the parallel branches of the manifold to cooperate with the elastic walls 310 to warn the operator that the nozzles have reached their low parking position.
  • Two filtering elements 400 are introduced into their devolved locations in a half-shell 110.
  • the cleaning means 500 are then placed in such a way that the nozzles 510 are placed inside the filtering elements 400 and the two half-shells 110, by clipping their staples 102.
  • the filtration device is introduced into the pit by connecting it to its outlet orifice. It is verified that the filter elements are placed in their low filtration position and that the nozzles are protected in their wells.
  • the effluent enters the device 100 through the openings 220, then passes from the inside to the outside the filter elements 400 which then retain the largest particles.
  • the filtered effluent enters the housing, then leaves the pit through its outlet to an ancillary filtration system.
  • the particles retained in the filter elements fall by gravity into the pit through the openings 220, especially in the absence of flow into the pit.
  • the operator When it is necessary to clean the filter elements, the operator, after having removed the lid of the pit, connects a pipe for supplying pressurized water to the connection 530. He pulls the handle 540 of the collector completely, so that the nozzles raise the filter elements in their high cleaning position. It repeatedly pushes and raises the handle 540 so that the nozzles 510 project pressurized water inside the filter elements over their full height. The holes O of the filter elements are uncorked and the particles discharged outside the filter elements escape through the openings 220. At the end of the cleaning, the operator lowers the handle 540 as much as possible to place the nozzles in their wells. 232. Disconnects the water supply pipe and closes the pit cover.
  • the filtration device of the invention simplifies the routine cleaning of its filter elements. An appreciable saving of time was obtained relating to its maintenance operations which are, moreover, less restrictive to implement.
  • the filtration device 100 incorporates remote maneuvering means to facilitate its installation and removal from the pit. It consists of a handle 320 whose free end is intended to be held in the hand of the operator who installs the device and whose other end is intended to be coupled to a tenon 330 secured to the housing 300 and more precisely the handle 302. It is retained via a guide means in translation, such as a pair of rails 303 made in the handle 302, to facilitate its mounting. A sleeve 340 is mounted on the end of the handle intended to be coupled to connect or disconnect it from the device.
  • the socket 340 is composed, on the Figs. 7 , a fixing tip 342 on said end of the handle, and a connection means 344 on the device.
  • a hole is made in said end of the handle to receive the tip 342 and a pin mounted radially immobilizes the handle.
  • the connection means 344 is constituted on these Figs. 7 , a thread capable of cooperating with a threaded hole made in the post.
  • the connection means can still take the form of a bayonet mechanism.
  • the post 330 is retained in the handle 302, near the intermediate branch of the manifold 540 forming the operating handle of the cleaning means.
  • the tenon 330 is extended by a wall 332 in the form of a hook, which is articulated on the tenon, thus forming a lock capable of overlapping this operating handle to, firstly, keep the nozzles in their low protected position and, on the other hand, also maintain the filter elements in their low filtration position.
  • the lock 332 is placed in a locking position of the operating handle in the low position.
  • the lock 332 has been operated in a release position of the operating handle of the cleaning means to allow its use.
  • a lug extends this lock to facilitate its maneuver. Note that the lock could be, in an embodiment not shown, a separate component of the pin.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtration Of Liquid (AREA)
EP11178708A 2010-08-25 2011-08-24 Filtervorrichtung Withdrawn EP2422864A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1056749A FR2964042B1 (fr) 2010-08-25 2010-08-25 Dispositif de filtration

Publications (1)

Publication Number Publication Date
EP2422864A1 true EP2422864A1 (de) 2012-02-29

Family

ID=43757863

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11178708A Withdrawn EP2422864A1 (de) 2010-08-25 2011-08-24 Filtervorrichtung

Country Status (2)

Country Link
EP (1) EP2422864A1 (de)
FR (1) FR2964042B1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4906357A (en) * 1987-07-26 1990-03-06 Mordeki Drori Filter system having multiple filter elements and back flushing assemblies
US5228993A (en) * 1990-02-09 1993-07-20 Mordeki Drori Cleanable filter system with longitudinally movable and rotatable cleaning member
US5667683A (en) * 1992-06-17 1997-09-16 Benian Filter Company, Inc. Backwashable liquid filter system using rotating spray
US5824229A (en) * 1996-04-19 1998-10-20 Larkey; James G. Filtration of rolling solutions
US5871640A (en) * 1997-03-25 1999-02-16 Gavin; Norman Filter and housing
US6495040B1 (en) * 1999-06-16 2002-12-17 Zoeller Co. Septic tank filtering system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4906357A (en) * 1987-07-26 1990-03-06 Mordeki Drori Filter system having multiple filter elements and back flushing assemblies
US5228993A (en) * 1990-02-09 1993-07-20 Mordeki Drori Cleanable filter system with longitudinally movable and rotatable cleaning member
US5667683A (en) * 1992-06-17 1997-09-16 Benian Filter Company, Inc. Backwashable liquid filter system using rotating spray
US5824229A (en) * 1996-04-19 1998-10-20 Larkey; James G. Filtration of rolling solutions
US5871640A (en) * 1997-03-25 1999-02-16 Gavin; Norman Filter and housing
US6495040B1 (en) * 1999-06-16 2002-12-17 Zoeller Co. Septic tank filtering system

Also Published As

Publication number Publication date
FR2964042B1 (fr) 2017-12-15
FR2964042A1 (fr) 2012-03-02

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